0445120273
BOSCH 0445120273 Common Rail Injector for Cummins ISBe 3.9L 5.9L, DAF LF & Ford Cargo
5263307, 5255184, 2830957, 1405332, 1407306, 1409652, BG9X9K526BA, 2R0198133F00RJ02130DSLA143P55401600 barProduct Overview
The Bosch 0445120273 is a heavy-duty CRIN2-16 common rail diesel fuel injector engineered for commercial truck and industrial applications powered by Cummins ISBe 3.9L / 5.9L, Iveco Tector, and related commercial engine platforms. Deployed across DAF LF45/LF55, Ford Cargo, and Volkswagen Constellation commercial fleets, this solenoid-actuated injector operates at rail pressures up to 1600 bar. The hydraulic circuit incorporates control valve assembly F00RJ02130, hole-type nozzle 0433175540 (stamped DSLA143P5540), and magnet assembly F00RJ02697 to deliver precise pilot and main injection events. Engineered for robust durability in Euro 3 and Euro 4 operating conditions, it requires exact torque sequencing and IMA calibration entry into the engine control module to guarantee balanced cylinder delivery and emission compliance.
CRITICAL FEED TUBE SEQUENCE: Never tighten the hold-down clamp before seating the high-pressure connector tube. Pre-torque the connector tube nut to 15 N·m first to align the spherical sealing interface with the injector body, torque the hold-down clamp bolt to 24 N·m, and finally torque the connector tube to 50-55 N·m to prevent high-pressure internal fuel leakage and DTC P0087.
Vehicle & Engine Fitment
| Vehicle | Engine | Years |
|---|---|---|
| DAF LF 45 / LF 55 Series Commercial Truck | Cummins ISBe / ISB / QSB 3.9L & 5.9L (Iveco NEF Tector) | 2005-2012 |
| Ford Cargo / F-250 Heavy Duty Commercial | Cummins ISBe / ISB / QSB 3.9L & 5.9L (Iveco NEF Tector) | 2005-2012 |
| Volkswagen Worker / Constellation / Delivery Medium-Duty | Cummins ISBe / ISB / QSB 3.9L & 5.9L (Iveco NEF Tector) | 2005-2012 |
| Iveco EuroCargo Tector Medium Commercial | Cummins ISBe / ISB / QSB 3.9L & 5.9L (Iveco NEF Tector) | 2005-2012 |
Technical Specifications
| Specification | Value |
|---|---|
| Fuel System | Bosch Common Rail (CRIN2-16) |
| Peak Pressure | 1600 bar |
| Control ValveCore Spec | |
| Nozzle CodeCore Spec | |
| Nozzle Part NumberCore Spec | |
| Magnet Assembly | F00RJ02697 |
| Seal Ring Kit | F00RJ02176 |
| Connector Tube Pre-Torque | 15 N·m |
| Hold-down Clamp Torque | 24 N·m📐 Torque & Angle Wizard → |
| Connector Tube Final Torque | 50-55 N·m |
| High Pressure Line Torque | 30-35 N·m |
| Coding Standard | Bosch IMA (6/7-Character Alphanumeric) |
| Operating PressureCore Spec |
Installation Tips
Tools needed: Calibrated torque wrench and line crowfoot tool, Brass injector bore seat brush kit and industrial vacuum extraction unit, Dedicated electronic diagnostic tool for IMA/injector coding
- Thoroughly ream and clean the cylinder head injector well down to bare metal using a specialized brass seat brush; blow out all carbon deposits and confirm zero debris remains.
- Fit a genuine new copper sealing washer of correct thickness (standard 1.5mm) onto the nozzle tip, and install a brand-new viton O-ring onto the injector body lubricated with clean engine oil.
- Lower the 0445120273 injector assembly straight into the bore, aligning the side fuel inlet port toward the cylinder head connector tube port, and snug the hold-down clamp bolt finger-tight (approx 3-5 N·m).
- Insert a new or meticulously inspected high-pressure connector tube (feed tube) through the cylinder head, and torque the connector tube retaining nut to the preliminary alignment specification of 15 N·m.
- Torque the injector hold-down clamp bolt to its final torque of 24 N·m to securely seat the copper washer against the cylinder head seat.
- Finalize torque on the high-pressure connector tube retaining nut to 50-55 N·m to establish a high-pressure metal-to-metal spherical seal.
- Connect the high-pressure fuel rail line using the 2-wrench counter-hold method, torque the line nut to 30-35 N·m, plug in the electrical solenoid harness, and programme the unique IMA calibration code into the ECM via diagnostic tool.
- High-Pressure Feed Tube Alignment Risk: Tightening the hold-down clamp bolt to 24 N·m before installing the feed tube will misalign the spherical sealing joint. This misalignment creates high-pressure internal fuel leakage into the valvetrain, leading to extended cranking, power loss, and fault code P0087. Always maintain the 15 N·m -> 24 N·m -> 50-55 N·m torque progression.
- Inspect Feed Tube Sealing Tip: Whenever replacing injector 0445120273, examine the brass/steel spherical tip of the high-pressure connector tube. Any edge erosion, scratching, or flattening necessitates replacing the connector tube assembly (Cummins 4929864 / 3957087) immediately; reusing damaged tubes causes immediate rail pressure loss.
- 2-Wrench Line Torquing Mandate: When tightening the high-pressure fuel rail line to 30-35 N·m, always counter-hold the connector tube retaining nut with a second open-ended wrench. Unopposed torque can twist the connector tube or crack the injector body fuel inlet socket.
Frequently Asked Questions
What symptoms indicate a failing Bosch 0445120273 injector on Cummins ISBe engines?
Common failure indicators include hard starting or long cranking when warm due to excessive dynamic backleakage past control valve F00RJ02130, black exhaust smoke under acceleration caused by worn nozzle DSLA143P5540 orifices, engine knocking under load, and diagnostic trouble code P0087 (Fuel Rail Pressure Too Low).
Is ECU coding required after installing injector 0445120273?
Yes. The 0445120273 injector features an individually calibrated alphanumeric IMA code laser-etched onto the electrical connector head. This code must be written to the engine ECM (Cummins INSITE, DAF DAVIE, or universal commercial scanner) to enable individual cylinder fuel volume and timing corrections.
What are the common OE cross-reference numbers for 0445120273?
Primary OE part numbers include Cummins 5263307, 5255184, 2830957, 2830221, 4896444; DAF 1405332, 1407306, 1409652; Ford BG9X9K526BA; Volkswagen 2R0198133, 2R0130201A; and Iveco 3230159500. The official Bosch exchange remanufactured part number is 0986435508.
What dynamic backleak rate is acceptable during bench testing?
At normal operating temperature under full load (1600 bar), maximum permissible return leakage should not exceed 45 ml/min per injector. Dynamic backleakage exceeding 50 ml/min confirms internal seat wear in control valve F00RJ02130, causing rail pressure drop and hot-restart refusal.
What is the correct coil resistance for solenoid testing?
Using a calibrated digital multimeter at 20°C ambient temperature, measurement across the two solenoid pins must indicate 0.25 to 0.50 Ohms. Resistance below 0.20 Ohms indicates shorted internal windings, while resistance above 0.60 Ohms indicates degraded terminal bonding, either of which triggers solenoid circuit DTCs P0201-P0206.
Diagnostic Trouble Codes & Fault Protocols
Common diagnostic trouble codes (DTCs) triggered when this common rail injector experiences wear, circuit faults, or calibration drift:
Fuel Rail / System Pressure Too Low
Excessive internal backleak from worn control valve seats drops common rail pressure below target under engine load.
Injector Circuit Malfunction / Open Circuit
Solenoid coil resistance drift (0.2-0.5 Ω) or piezo stack degradation triggers driver stage shutdown on affected cylinders.
Cylinder Misfire & Balancing Deviation
Carbon-clogged nozzle spray holes or missing IMA calibration causes uneven cylinder contribution. Recode ECM and verify washer seating.
Fuel Rail / System Pressure Too High
Spill line backpressure or stuck metering valve prevents rail depressurization, creating overpressure risks under load.
Cross-Reference & Compatibility
Sister parts, same-platform variants, and known incompatibilities.
Technical Diagnostic & Service Protocols
Authoritative field procedures, diagnostic testing thresholds, and service SOPs for this assembly.